Jackson, who left spring training with elbow tendinitis, has pitched well in two starts since returning to action - including a strong 6.2-inning, one-run outing Tuesday that puts him on a natural schedule to start again Sunday, possibly for the Cubs, the Chicago Sun-Times reports.

Back in the rotation for Triple-A Iowa, Jackson got roughed up in his last start on Thursday, allowing six runs on eight hits in four innings. The 22-year-old righty did not walk a batter and struck out two.

As a 22-year-old at Triple-A, Jackson held his own, but not much more. On the positive side, his command improved significantly (just 2.75 BB/9IP), but he was inconsistent from start to start, and his strikeout rate dropped to 6.82 K/9IP from 8.16 at Double-A the year before. Jackson also moved into the bullpen for seven effective appearances before returning to the rotation in late May. Jackson throws a low-90s fastball, with a changeup, slider and curve, and should get a chance to compete for one of the last rotation spots this spring.

2010

With a low-90s fastball, and a promising curve, slider and changeup, Jackson climbed through three levels last year, missing bats and keeping the ball in the park along the way. His command is still an issue as he walked 39 in 82.2 Double-A innings, but Jackson is not far away from a major league debut. Expect him to compete for the No. 5 starter job in camp, but unless he blows the Cubs away, he'll begin the year at Triple-A.

2009

Jackson has pitched extremely well as a pro so far, dominating High-A ball in his first look at professional hitters. He could be a big bargain in the ninth round, thanks to a 90+ fastball and better-than-expected breaking stuff.